Solar Battery Storage Installation in West Sussex & the South East
Store solar energy during the day. Charge from the grid when rates are low. Use your stored energy when your home or business needs it most. Omni3 designs and installs smart battery storage systems from EcoFlow, Sigenergy and SolaX — helping you reduce reliance on the grid, make better use of your solar panels and take advantage of time-of-use tariffs.
How battery storage works
A battery stores energy from your solar panels or the grid when electricity is cheap, then releases it when you need it most.
With solar panels
- → Panels generate free electricity during daylight
- → Surplus energy charges your battery instead of being exported
- → Battery powers your home in the evening at zero cost
- → Self-consumption jumps from 50–70% to 70–90%
Without solar (grid-only)
- → Battery charges overnight at the cheapest tariff rates
- → Stored energy powers your home during expensive peak hours (4–7pm)
- → Ideal for time-of-use tariffs like Octopus Agile or Go
- → Typical savings of 30–50% on peak electricity costs
Best results: solar + battery + smart tariff
Combining all three gives you maximum control over your energy costs. We design systems optimised for half-hourly tariffs, load shifting and energy arbitrage.
Learn about solar panel installation →Specialist battery brands we install
We do not believe in one-size-fits-all battery storage. The right system depends on your property, your usage, your tariff, your solar setup and whether you want EV charging or backup power. That is why Omni3 focuses on three strong battery storage platforms: EcoFlow, Sigenergy and SolaX.
EcoFlow
EcoFlow battery storage is a strong choice for homes that want flexibility, clean design and intelligent energy control. The PowerOcean system is expandable, uses LFP battery chemistry, supports app and web monitoring, and supports dynamic tariff optimisation. It allows you to store surplus solar energy, charge from the grid at cheaper times and manage your energy through a clear app-based platform.
Best for: Smart modular home battery storage
Sigenergy
Sigenergy's SigenStor system is designed for customers who want more than a standard battery. It brings energy storage, solar control, EV charging capability and intelligent energy management into one integrated platform — a premium all-in-one 5-in-1 system combining solar inverter, EV DC charger, battery PCS, battery pack and energy management. For homes and businesses looking for a high-end, future-ready energy system, Sigenergy is one of the most advanced options we install.
Best for: Premium all-in-one energy system
SolaX
SolaX battery storage is a practical, reliable option for homes that want to get more from their solar panels. The X1-Hybrid G4 range includes 3.0kW to 7.5kW single-phase hybrid inverters, can form the X-ESS G4 system with battery and Matebox, and supports smart EV charger and heat pump integration. With hybrid inverter technology, smart energy management and compatibility with wider home energy systems, SolaX is a strong choice for households looking to reduce grid reliance and improve solar self-consumption.
Best for: Reliable hybrid solar & battery storage
Which battery system is right for you?
| Brand | Best for | Typical customer |
|---|---|---|
| EcoFlow | Smart modular home battery storage | Homeowners wanting flexibility, app control and expandability |
| Sigenergy | Premium all-in-one solar, battery and EV energy system | Customers wanting the most integrated, future-ready setup |
| SolaX | Reliable hybrid solar and battery storage | Homeowners wanting a practical, proven solar battery system |
During your survey, we look at your roof, electrical supply, energy bills, usage pattern, tariff and future plans. We then recommend the most suitable battery system rather than pushing one brand for every property.
What affects battery storage cost?
Battery capacity (kWh)
A typical home battery is 5–13 kWh. Larger homes or those with EVs may need more. Commercial systems can be 50 kWh+.
Hybrid vs AC-coupled
Hybrid inverters (combined solar + battery) are more cost-effective for new installations. AC-coupled batteries can be retrofitted to existing solar systems.
Number of battery units
Most brands allow stacking multiple units. More capacity means more stored energy but higher upfront cost. We size to your actual usage.
Integration with solar
Adding a battery to a new solar installation is cheaper than retrofitting. We design combined systems from the start for maximum efficiency.
Smart tariff compatibility
Systems optimised for Octopus Agile, Go or similar tariffs need specific inverter settings and scheduling. We configure this as part of commissioning.
Installation complexity
Wall-mounted batteries are standard. Floor-standing units need adequate space. Outdoor installations may need weatherproof enclosures.
Battery storage typically adds £3,000 – £8,000 to a solar installation
Standalone battery-only systems start from around £4,000. We provide exact pricing after your free survey.
Common battery storage mistakes
Buying too small a battery
A 5 kWh battery sounds affordable but may only cover 2–3 hours of evening usage. We size batteries based on your actual consumption patterns, not just budget.
Ignoring tariff optimisation
A battery without smart tariff scheduling is leaving money on the table. We configure charge/discharge schedules to buy cheap and use smart — especially on Octopus Agile or Go.
Not pairing with solar
A battery-only setup works, but combining with solar panels dramatically improves ROI. Free daytime generation plus cheap overnight charging gives you the best of both worlds.
Expecting zero grid usage
Even with solar and battery, you will still use some grid electricity — especially in winter. We set realistic expectations so you are never disappointed.
Battery storage FAQ
Ready to take control of your energy?
Use our free configurator to design your solar and battery system online, or book a survey and we will assess your property, review your energy usage and recommend the most suitable system for your needs.
01798 263333